光敏核不育水稻的光温反应研究：Ⅱ．人工控制条件下粳型光敏不育系的育性鉴定

 在人工控制条件下研究了光照时间和温度对农垦58S及以此为基因源转育的其他粳型光敏不育系育性的影响。结果表明，供试粳型光敏不育系的育性受光照时间和温度的双重影响， 在15.0 h光长与29.6℃平均温度(最高与最低温度分别为33.0℃与28.0℃)的长光照高温条件下，自交结实率为0或接近于0；在12.0 h光长与23.6℃平均温度(27.0／22.0℃)的短光照低温条件下， 自交结实率较高；在长光低温(15.0 h／23.6℃)和短光高温(12.0 h／29.6℃)下，育性出现不同程度的转变。不同材料的育性对光温反应存在着差异，提示遗传背景对育性表达可能有重要作用。本研究结果有助于对自然条件下光敏不育系夏季制种纯度不高而秋季繁种产量又较低的现象在理论上给予合理的解释。

Studies on Response to Photoperiod and Temperature of the Photoperiod Sensitive Genie Male Sterile Rice(PGMSR): Ⅱ. Identification of japonica PGMSR in growth chambers

The effects of photoperiod and temperature on fertility of Nongken 58S and its derived PGMSRs (subsp. japonica) were studied in artificially controlled condition. The results indicated that both photoperiod and temperature affected PGMSRs' fertility. The PGMSRs were sterile or nearly sterile in the treatment combination with long photoperiod (15. 0 h) and high temperature (29. 6℃), and their fertility was higher in the treatment combination with short photoperiod (12. 0h) and low tempera-ture (23.6℃). The alternation in the fertility of PGMSRs occurred under the treatment combinations with15. 0h/ 23.6℃ and 12. 0h/ 29. 6℃ in growth chambers. The influence of genetic background on PGMSRs' fertility was also observed. The experiment result will supply a base of knowledge to explain why the sterility of PGMSRs was unstable in summer and their fertility was not high enough in autumn in the field.